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    LAMINATED POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM
    31.
    发明专利
    LAMINATED POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH07230618A

    公开(公告)日：1995-08-29

    申请号：JP1938494

    申请日：1994-02-16

    Applicant: TORAY INDUSTRIES

    Inventor： ITO KIYOHIKO ,  SHIMIZU YUJI ,  KIDA KATSUMI

    IPC: B32B27/36 ,  C08K5/00 ,  C08L67/00 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

    Abstract: PURPOSE:To obtain a laminated polyester film useful as a base film for magnetic recording media which has excellent scratching resistance and traveling durability in spite of repetitive use and meets requires for enhancement of image quality. CONSTITUTION:The polyester film (B) contg. 0.2 to 8wt.% inert particles having a weight average particle size 0.1 to 2.0mum in polyester is laminated on at least one surface of the polyester film (A) having a thickness 3mum. The number X (pieces/mm ) of surface projections of height 200 to 400nm and the number Y (pieces/mm ) of surface projections of height 400 to 800nm by 2muR stylus of the polyester film (B) and the three-dimensional average surface height SRa thereof are so set as to simultaneously satisfy the following equations (1) to (3): 1300

    POLYESTER FILM
    33.
    发明专利
    POLYESTER FILM 失效

    公开(公告)号：JPS63178143A

    公开(公告)日：1988-07-22

    申请号：JP819887

    申请日：1987-01-19

    Applicant: TORAY INDUSTRIES

    Inventor： ICHIKAWA YOEN ,  KIDA KATSUMI ,  MORIMOTO HIROYUKI

    IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00

    Abstract: PURPOSE:To make it possible to form a biaxially oriented polyester film for magnetic tapes low in defects such as dropout and head plug by reducing whiskers formed on the slitted surface during film slitting, by controlling the surface orientation coefficient, the density and the crystal size to have a specified relationship. CONSTITUTION:A polyester film which is a biaxially oriented polyester film comprising at least 95mol.% polyethylene terephthalate and satisfies the relationship among the surface orientation coefficient, the density and the crystal size: surface orientation coefficient >19.6-3.5log A. The surface orientation coefficient is represented by formula 1, wherein nMD is the refractive index along the machine direction, nTD is the refractive index along the transverse direction and nZD is the refractive index along the direction of thickness. A is defined by the equation: A = [density/(crystal size) ] X 10 (density: g/cm , crystal size: nm).

    BIAXIALLY ORIENTED POLYESTER FILM FOR MAGNETIC TAPE
    34.
    发明专利
    BIAXIALLY ORIENTED POLYESTER FILM FOR MAGNETIC TAPE 失效

    公开(公告)号：JPS62158726A

    公开(公告)日：1987-07-14

    申请号：JP29881185

    申请日：1985-12-29

    Applicant: TORAY INDUSTRIES

    Inventor： ICHIKAWA YOEN ,  MOGI MASAHIKO ,  KIDA KATSUMI

    IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08K3/00 ,  C08K3/02 ,  C08L67/00 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733

    Abstract: PURPOSE:To obtain the titled film improved in abrasion resistance and running stability, by using a composition obtained by adding specified non-incorporated particles depositing in a reaction system and a surface-roughening agent to a polymer based on a polyester. CONSTITUTION:A composition is obtained by adding non-incorporated particles depositing in a reaction system (A), average particle diameter of 0.3-3mu, containing at least 1 part of at least one element selected from among 0.005-0.025wt% Li, 0.01-0.04wt% Ca, 0.02-0.05wt% P and 0.02-0.04wt% Sb and 0.005-0.2wt% inorganic inert incorporated particles (B) (e.g., TiO2) of an average particle diameter of 0.1-3mu as a surface-roughening agent to a polyester based on an aromatic dibasic acid ester containing at least 80mol%, based on the main repeating units, ethylene terephthalate units. This composition is formed into a sheet, and this sheet is biaxially oriented to obtain a biaxially oriented polyester film for magnetic tapes on at least either surface of which fine protrusions of a parameter of distribution (PD value) >=0.5 are formed.

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